Research on OFDM Signal Detection Method Based on Intrawell Stochastic Resonance of Bistable System

doi:10.16182/j.issn1004731x.joss.21-0368

Abstract

Abstract:

In order to solve the problem of weak OFDM (orthogonal frequency division multiplexing)signal detection at the receiver in OFDM transmission system, the intrawell stochastic resonance of bistable system is combined with the OFDM signal enhancement and demodulation process. Analytical expression is derived for the time required to change from zero state to potential well state for the intrawell stochastic resonance system under the excitation of multicarrier signals, and the energy loss of multicarrier signals in one symbol caused by the transient response is analyzed. The steady-state output equation of system is derived, and the problem of superimposing the DC bias component to the modulated subcarrier signal in the steady-state process is analyzed. The influence of intrawell stochastic resonance on the demodulation performance of OFDM signal under different system parameters and noise intensity is discussed. Simulation results show that the proposed method can effectively realize the synergy between signal and noise, which improves detection performance of OFDM signal.

Key words: Intrawell stochastic resonance, nonlinear detection, transient response, weak OFDM(orthogonal frequency division multiplexing) signal

CLC Number:

TP391

Gaohui Liu, Ying Liang. Research on OFDM Signal Detection Method Based on Intrawell Stochastic Resonance of Bistable System[J]. Journal of System Simulation, 2022, 34(09): 2046-2055.

Figures/Tables 7

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